87results about How to "Improved defect resistance" patented technology

One mode of the blade made of titanium carbonitride-based cermet is that it has a structure composed of 75-90 area % of hard phase and the balance is a binding phase. The hard phase has: the core is made of titanium carbonitride Phase composition, the peripheral part is composed of a first hard phase with a core structure composed of Ta and/or Nb, Ti, and W complex carbonitride (hereinafter expressed as (Ti, W, Ta/Nb)CN) phase; Both the core and the peripheral part are the second hard phase with a core structure composed of (Ti, W, Ta/Nb) CN phase; the third hard phase with a single-phase structure composed of TiCN phase, and the binding phase has: Co: 18-33%; Ni: 20-35%; Ta and/or Nb, and Ti, the total amount: 5% or less; W: 40-60%. Another form of the titanium carbonitride-based cermet blade is the sum of the value of Ti converted into carbonitride, the value of Ta and/or Nb converted into carbide, and the value of W converted into carbide It is 70-95% by mass, the value of W converted into carbide is 20-35% by mass, Co and Ni are 5-30% by mass, and have a structure composed of hard phase and binder phase. The hard phase has (Ti , W, Ta/Nb) CN, the binding phase is mainly composed of Co and/or Ni, and W, and 40-65% by mass of W is contained in the hard phase. This cutting tool has a holder and the cermet blade fixed by the holder.

Disclosed is a cutting tool having high wear resistance, high lubricating properties and excellent defect resistance. Specifically disclosed is a cutting tool (1) comprising a base (2) and a coating layer (6) or (9) that covers the surface of the base (2), wherein the coating layer (6) or (9) comprises a first layer (7) comprising Ti1-a-b-c-dAlaWbSicMd(C1-xNx) [wherein M represents at least one member selected from Nb, Mo, Ta, Hf and Y; 0.45<=a<=0.55; 0.01<=b<=0.1; 0<=c<=0.05; 0.01=<d=<0.1; and 0=<x<=1] and a second layer (8) comprising Ti1-e-f-gAleSifM'g(C1-yNy) [wherein M' represents at least one member selected from Nb, Mo, Ta, Hf and Y; 0.50<=e<=0.60; 0<=f<=0.1; 0.05<=g<=0.15; and 0<=y<=1].

Disclosed is a method for manufacturing a flux cored wire for welding stainless steel of 0.9-1.6 mm in diameter having a seamed portion, which the method includes the steps of: forming a hoop (stainless steel 304L or 316L) into a U-shape and filling the hoop with a flux mixture, thereby forming a tube having a seamed portion; performing a primary drawing process on the tube shaped wire using a lubricant; performing a bright annealing process to relieve work hardening of the primarily drawn wire; performing a secondary drawing process on the wire until an accumulated reduction ratio after the bright annealing process falls within the range of 38-60%; physically removing a lubricant residue on the surface of the secondarily drawn wire; and coating the wire with a surface treatment agent.

The invention discloses a high-toughness cBN (cubic boron nitride)-based ultrahigh pressure sintering material and a cutting tool manufactured by the same and having excellent crack resistance. The high-toughness cBN cubic boron nitride-based ultrahigh pressure sintering material and the cutting tool made of the same material comprise at least one powder particle such as Ti nitride powder particles and Al, alloy of Al and Ti, oxide of Al and nitride of Ti and Al as a combined phase forming ingredient in a cBN-based ultrahigh pressure sintering material including the organization of a hard dispersed phase and a combined phase, besides, as the hard dispersed phase forming ingredient, the high-toughness cBN cubic boron nitride-based ultrahigh pressure sintering material and the cutting tool made of the same material comprise cBN, wherein 50% of the accumulation grain size of the powder particles which form the combined phase is 0.6-0.9 microns, furthermore, when the cBN-based ultrahigh pressure sintering material is diffracted by X ray, a diffraction peak of a composite compound of Ti, Al and N appears within a diffraction angle range that 2theta is not smaller than 40.5 degrees and not larger than 41.4 degrees, and I/I0 is not smaller than 0.15 and not larger than 0.3 when the intensity of the diffraction peak of the composite compound of Ti, Al and N is set to be I and the intensity of the diffraction peak of cBN is set to be I0.

The invention provides a defect and abrasion resistant surface coating and cutting tool. The surface of a body of the tool is coated with a hard coating layer via the physical evaporation. The hard coating layer is composed of a composite arbonitride layer or a nitride layer which is represented by the formula (Al1-x-y CrxSiy)(N1-zCz) and has the average thickness of 0.5 to 8.0[mu]m. The hard coating layer includes metal particles, and above 90 atom % of the elements of the metal particle are metal elements, and the cross section long diameter is from 0.05 to 1.0[mu]m. The metal particles are arranged in the hard coating layer at 3 to 20% of the longitudinal section area rate. In the metal particles, when the elements includes Al of above 50 atom%, and the aspect ratio of the longitudinal section is above 2.0, the cross long diameter form an 45 degree included angle with the surface of the substrate, the longitudinal section ratio is A%, and when the longitudinal section ratio is B%, 0.3<=A/(A+B).

The purpose of the present invention is to provide a cBN tool which can exhibit excellent chipping resistance and excellent wear resistance even when used for the intermittent cutting of a high-hardness steel and can also exhibit excellent cutting performance throughout long-term use. The purpose can be achieved by providing a cutting tool made from a cBN sintered material, in which a cBN sintered material that contains at least cBN particles as a hard phase component is employed as a tool base, wherein each of the cBN particles has an Al2O3 layer that has, on the surface thereof, slits formed at an average formation ratio of 0.02 to 0.20 inclusive and has an average layer thickness of 1.0 to 10 nm, the cBN sintered material has, around the periphery of each of the cBN particles, a binder phase comprising TiN alone or a combination of TiN and TiC, TiB2, TiCN, AlN, Al2O3, WC or the like, and the sum total of the content of Al2O3 formed on the surface of each of the cBN particles and the content of Al2O3 present in the binder phase is 2 to 40 vol% on average wherein the volume of a region of each of the cBN particles which lies between the surface of each of the cBN particles and a zone located at the depth of 50 nm from the above-mentioned surface is defined as 100 vol%.

The invention provides a surface-coated cutting tool with knife broken resistance and excellent performance of hard-coated layer in high-speed cutting processing. In the surface-coated cutting tool, a Ti compound layer at least including a TiCN layer is formed as a lower layer on the surface of the tool body, an Al2O3 layer including Zr as the upper layer, wherein kappa-Al2O3 crystallites containing Zr and alpha-Al2O3 crystallites containing Zr are included, In addition, kappa-Al2O3 crystallites containing Zr as an upper layer is fomed over the TiCN[110] crystallites, and alpha-Al2O3 crystallites containing Zr as an upper layer is formed over TiCN[112]. More than 30% of the alpha-Al2O3 crystallites comprises Al2O3[0001] crystallites, and the crack density of alpha-Al2O3 crystallites containing Zr is high than that of kappa-Al2O3 crystallites containing Zr.

The invention discloses a high-hardness and high-strength WC-Co-based hard alloy. The high-hardness and high-strength WC-Co-based hard alloy comprises the following raw materials in parts by weight: 80-90 parts of WC powder, 5-15 parts of Co powder and 0.5-3 parts of an additive, wherein the additive consists of metal carbide and metal nitride; and the bending strength of the hard alloy is as highas 4810N/mm < 2 >, and the hardness of the hard alloy is as high as 94.5HRa. The invention further discloses a preparation method of the hard alloy. The hard alloy is prepared by performing multi-stage sintering on the raw materials of 0.8 microns m or below, and the adopted additive effectively inhibits the formation of polycrystalline in the sintering growth of the alloy, so that the high-hardness and high-strength performance of the hard alloy is realized. The invention further discloses a cutting tool prepared from the hard alloy. Due to the increase of the strength and the hardness of the cutting tool, the defect resistance is improved, and the service life is obviously prolonged.

A diamond coated tool according to the present invention includes a base material, and a diamond layer coating a surface of the base material, the diamond layer containing a diamond, 1.0×10¹⁸ to 1.0×10²² atoms/cm³ of boron, and 1.0×10¹⁷ to 1.0×10²¹ atoms/cm³ of nitrogen.

An object of the present invention is to provide a cBN sintered body cutting tool with excellent toughness. While being used for interrupted cutting of high-hardness steel even if in the situation requiring high-load cutting conditions, the cutting tool provided by the invention is prevented from proneness to the cracks and defects of the blade and has excellent cutting performance which can be maintained for a long term. The cBN sintered body cutting tool comprises a sintered body including cubic boron nitride and a binder phase as a tool substrate, wherein a binder phase structure is existed in the area within 100nm from the grain boundary of the cubic boron nitride towards the binder phase, and is composed of one or more than two selected from the group of nitrides, carbides, carbon nitrides and borides of Ti, nitrides, borides and oxides of Al, and solid solution of more than two of them, and inevitable impurities, and has fine structures with an average volume diameter MV of 10-80 nm. Thus, the object of the present invention is achieved.

The invention provides a blade-breaking-resistant surface-coated cutting tool with an excellent rigid coating layer performance during high-speed heavy-cutting machining. On the surface of a tool matrix, for a lower part layer (a), a Ti compound layer is formed through vapor deposition, and for an upper part layer, an alpha-type Al2O3 surface which has a panel polygon (consisting of a flat hexagon) and vertical long grain structure and contains Ti is formed through vapor deposition to be coated on the cutting tool, and among the grains of the upper part layer, the interiors of the grains with the area ratio being more than 60% are segmented by at least two lattice interfaces which are expressed by sigma 3 and constituted in the form of constituent atom common lattice points.

The invention provides a cutting tool prepared from a cubic crystalline boron nitride ultrahigh pressure sintering material, and the cutting tool exhibits excellent defect resistance in steel and cast-iron cutting. The cutting tool prepared from the cubic crystalline boron nitride ultrahigh pressure sintering material comprises, by volume, 50-85%, preferably 70-85%, of cubic crystalline boron nitride particles, with the balance mainly being aluminum oxide. When the detection is carried out on the cross section of the cubic crystalline boron nitride ultrahigh pressure sintering material, the total area of cubic crystalline boron nitride particles swarms accounts for higher than 10% and lower than 35% of the total area of the cubic crystalline boron nitride particles, the area of the cubic crystalline boron nitride particles swarms is larger more than 2.5 times of the average area of the cubic crystalline boron nitride particles, and the average area can be obtained through the calculation on the average particle size of the cubic crystalline boron nitride particles, so that the defect resistance is improved.

The invention provides a surface wrapping cutting tool giving plays to excellent defect resistance, stripping resistance and adhesive strength during a small-caliber low speed cutting or high speed heavy cutting process and having a heterogeneous extension interface of a hard wrapping layer. The surface wrapping cutting tool is characterized by wrapping to form a columnar crystal organization TiA1N layer on a WC hard substrate surface via a physical vapor deposition, and when the crystal particle interface length in which [0001]WC is parallel with [110] TiA1N and [10-10]WC is parallel with [001] TiA1N is XA, and the crystal particle interface length in which [0001]WC is parallel with [111] TiA1N and [11-20]WC is parallel with [110] TiA1N is XC, possessing the heterogeneous extension interface satisfying the relationship of 1>(XA+XC)/X>=0.3(wherein, the X represents the interface total length) on the WC hard substrate surface and the surface of the TiA1N layer.

The present invention provides a surface coating cutting tool with a hard coating layer playing excellent fracture resistance and excellent defect resistance in high-speed heavy cutting. The hard coating layer comprises a lower layer and an upper layer formed through chemical vapor deposition, wherein (a) the lower layer is a Ti compound layer which comprises at least one layer or more than two layers from the groups of a Ti carbonitride layer, a nitride layer, a carbonitride layer, a oxycarbide layer and a oxycarbonitride layer, and has a total average layer thickness of 3-20 [mu]m; and (b) the upper layer is an alumimum oxide layer having an average layer thickness of 2-25 [mu]m, the alumimum oxide layer forming the upper layer has a columnar longitudinal growth alumimum oxide crystal structure in which particles alumimum oxide are dispersed and distributed.

Provided is a surface coating cutting tool with superior defect resistance and abrasion resistance. A surface coating cutting tool having a hard coating layer coated and formed on the surface of a tool substrate by means of a physical vapor deposition method, wherein the hard coating layer is formed of a compound carbonitride layer or a compound nitride layer with an average layer thickness of 0.5 to 8.0 [mu]m expressed by the compositional formula (Al1-x-yTixSiy)(N1-zCz), the hard coating layer contains metallic particles with an average sectional major axis of 0.05 to 0.5 [mu]m in which 90 at% or more of the constituent elements are metallic elements, the metallic particles are dispersed and distributed in the hard coating layer at a longitudinal section area ratio of 3 to 18 %, the constituent elements contain Al of 50 at% or more among the metallic particles, and when the longitudinal sectional area ratio of a particle satisfying conditions such as the aspect ratio of the longitudinal sectional shape being 2.0 or more and the acute angle formed between the sectional major axis and the substrate surface being 45 DEG or less is taken as A%, and when the longitudinal sectional area ratio of another particle is taken as B%, 0.3<=A/(A+B).

The present invention provides a surface-coated cutting tool having excellent defect resistance, and relates to a surface-coated cutting tool characterized in comprising: a base material of WC-based cemented carbide and a coating formed by chemical vapor deposition on the surface of the base material; a cutting face, a flank face, and a cutting-blade ridgeline part disposed between the cutting face and the flank face being provided; the total film thickness of the entire coating having an average value of 3-20 [mu]m; and at least one diagonal crack having an advance angle of 45 DEG or less in relation to the surface of the coating being present on the cutting surface within 300 [mu]m of the cutting blade ridgeline part.

This invention provides an MnCoZn ferrite containing, as basic constituents, 45.0% by mole or more but less than 50.0% by mole of iron calculated as Fe2O3, 15.5 to 24.0% by mole of zinc calculated asZnO, and 0.5 to 4.0% by mole of cobalt calculated as CoO with the balance being manganese, and containing, as sub-constituents to the basic constituents, 50 to 300 ppm by mass of SiO2 and 300 to 1300ppm by mass of CaO, with the balance being unavoidable impurities, wherein the amounts of Cd, Pb, Sb, As and Se in the unavoidable impurities are suppressed to less than 20 ppm by mass each, and furthermore, the Rattler value is brought to less than 0.85%, the coercive force at 23 DEG C to 15 A/m or lower, the specific resistance to 30 ohm*m or higher, and the Curie temperature to 100 DEG C or higher. In this manner, the MnCoZn ferrite not only has excellent magnetic properties of high resistance and low coercive force, but also has excellent mechanical strength.

An object of the present invention is to provide a coated cutting tool which has excellent wear resistance and fracture resistance and which accordingly allows for an extended tool life. The inventionrelates to a coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises a lower layer, an intermediate layer and an upper layer, the lower layer, the intermediate layer and the upper layer being laminated in order from the substrate side toward a surface side of the coating layer; the lower layer comprises one Ti compound layer or two or more Ti compound layers; the intermediate layer contains alpha-Al2O3; the upper layer contains TiCN; an average thickness of the lower layer is from 4.0 [mu]m or more to 10.0 [mu]mor less; an average thickness of the intermediate layer is from 3.0 [mu]m or more to 10.0 [mu]m or less; an average thickness of the upper layer is from 1.5 [mu]m or more to 6.5 [mu]m or less; a ratio of a length of sigma3 grain boundaries to a total 100% length of all grain boundaries in a specific region of the upper layer is from 20% or more to 60% or less; and a ratio of (111)-oriented grainsin the upper layer is 30 area% or more.